CN114058841A - Method for controlling chemical components of alkali-containing metal pellet ore by controlling reduction expansion rate - Google Patents
Method for controlling chemical components of alkali-containing metal pellet ore by controlling reduction expansion rate Download PDFInfo
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- CN114058841A CN114058841A CN202111355757.9A CN202111355757A CN114058841A CN 114058841 A CN114058841 A CN 114058841A CN 202111355757 A CN202111355757 A CN 202111355757A CN 114058841 A CN114058841 A CN 114058841A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
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Abstract
The invention discloses a method for controlling chemical components of alkali-containing metal pellets, which aims at controlling reduction expansion rate, wherein a binder with the weight percentage of 1.6-2.5 percent is added into an iron-containing raw material and is fully mixed to obtain a mixture; the iron-containing raw material comprises the following components in percentage by weight: 40 to 100 percent of magnetite concentrate containing K2O, Na2O and F, 0 to 40 percent of common magnetite concentrate and 1.0 to 2.5 percent of externally-matched silica; and (3) preparing the mixture into green pellets by applying a pelletizing disc, wherein the pelletizing disc has the following technological parameters: the preparation time of green balls is 10min, the compaction time is 21min, the rotating speed of a ball disc is 30r/min, and the diameter of the ball disc is 1 m; the average particle size of the small balls is 11 mm; and drying, preheating, roasting and soaking the green pellets to obtain the oxidized pellets. The invention controls the reduction expansion rate to be less than 20 percent under the condition of preparing the acid pellet ore by adding 40 to 100 percent of baiyuneboite iron ore concentrate.
Description
Technical Field
The invention relates to the field of agglomeration of ironmaking raw material pellets, in particular to a method for controlling chemical components of alkali-containing metal pellets by using a control reduction expansion rate as a target.
Background
770 million tons of Bayan Obo iron ore concentrates are produced annually, Bayan Obo iron ore concentrates are used as main iron-containing raw materials in the Bayan Obo iron ore concentrates in the steel-clad ironmaking production, the Bayan Obo iron ore concentrates belong to ultrafine-granularity magnet iron ore concentrates, the proportion of-200 meshes is more than 90 percent, and the proportion of-325 meshes is more than 75 percent, so that the Bayan Obo iron ore concentrates are more suitable for pellet production compared with sintering raw materials. But because of containing harmful elements such as potassium, sodium, fluorine and the like, the reduction expansion rate of the pellets is high, the proportion of the special Bayan Obo concentrate in the production of the acid pellets cannot exceed 35 percent, but because the price of iron concentrate for outsourcing pellets is high and the supply is in short supply, the capacity exertion of the steel-coated pellets and the reduction of the iron-making cost are restricted. The baiyuneboite ore concentrate conveyed by the steel-coated ore pulp pipeline has high grade and fine granularity, and the problem that how to improve the application proportion of the ore concentrate in pellet production is to be solved urgently in steel coating is solved.
Aiming at the particularity of the Bayan Obo iron ore concentrate, the method aims to meet the strategic requirements of Bayan Obo iron ore concentrate on high-quality and high-yield application in steel-coating sintering and pelletizing production. The system of the invention develops the technical scheme that the steel-coated pellet improves the proportioning of the baiyuneboite concentrate under the condition that the reduction expansion rate is controlled to be less than 20 percent and 40 to 100 percent of the baiyuneboite iron concentrate is added to prepare the acid pellet, the reasonable control and research work of the chemical components of the pellet is carried out, the situation of the shortage of the supply of the concentrate in a company area is relieved, and the technical support is provided for further improving the proportioning of the baiyuneboite iron concentrate, realizing the high-quality application of the baiyuneboite iron concentrate in steel-coated sintering and pellet production and the adjustment of the purchasing strategy of iron materials of the company. Meanwhile, the method plays a demonstration leading role in producing the pellet ore by using the ultrafine-grained magnetite concentrate and the fluorine-containing alkali-containing complex paragenetic ore for the metallurgical enterprises in China.
Disclosure of Invention
The invention aims to provide a method for controlling chemical components of alkali-containing metal pellets by taking the control of reduction expansion rate as a target, which is a reasonable control scheme of the chemical components of the pellets under the condition that the reduction expansion rate is controlled to be less than 20 percent and 40 to 100 percent of bayan obo iron ore concentrate is added to prepare acid pellets.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a method for controlling chemical components of alkali-containing metal pellets, which aims to control reduction expansion rate, and comprises the following steps:
adding 1.6 to 2.5 weight percent of adhesive in the iron-containing raw material, and fully mixing to obtain a mixture; the iron-containing raw material comprises the following components in percentage by weight: 40 to 100 percent of magnetite concentrate containing K2O, Na2O and F, 0 to 40 percent of common magnetite concentrate and 1.0 to 2.5 percent of externally-matched silica;
and (3) preparing the mixture into green pellets by applying a pelletizing disc, wherein the pelletizing disc is controlled by the following process parameters: the green ball preparation time is 10min, the compaction time is 21min, the rotating speed of a ball disc is 30r/min, and the diameter of a pellet is 1 m; the average particle size of the small balls is 11 mm;
drying, preheating, roasting and soaking the green pellets to obtain oxidized pellets;
wherein the drying conditions are: the temperature is 150-300 ℃, and the time is 15-30 min; the preheating condition is as follows: the temperature is 600-1000 ℃, and the time is 5-10 min; the roasting conditions are as follows: the temperature is 1160-1220 ℃, and the time is 8-12 min; the soaking conditions are as follows: the temperature is 900-1000 ℃, and the time is 2-4 min;
in order to ensure that the reduction expansion rate of the pellets is less than or equal to 20%:
using 100% K2O、Na2O, F pellet prepared from magnetite concentrate, pellet SiO2The lower limit of the content control is 4.90 percent, and the upper limit of the alkalinity control is 0.25;
using 90% of K2O、Na2O, F pellet, SiO2The lower limit of the content control is 4.60 percent, and the upper limit of the alkalinity control is 0.25 to 0.30;
using 80% of K2O、Na2O, F the pellet is prepared by mixing the pellet with SiO2The lower limit of the content control is 4.60 percent, and the upper limit of the alkalinity control is 0.25 to 0.30;
using 70% of K2O、Na2O, F pellet, SiO2The lower limit of the content control is 4.20-4.30%, and the upper limit of the alkalinity control is 0.25;
using 50-60% of K2O、Na2O, F pellet, SiO2The lower limit of the content control is 4.10-4.20%, and the upper limit of the alkalinity control is 0.30.
Further, the said compound contains K2O、Na2O, F the chemical components of the magnetite concentrate comprise the following components in percentage by weight: 65.5 to 66.5 percent of TFe, 28.5 to 29.5 percent of FeO, 0.60 to 0.80 percent of MgO, 1.70 to 2.40 percent of CaO, and Al2O3≤0.20％，SiO20.80-1.70 percent of S, 0.65-1.05 percent of F, 0.25-0.35 percent of K20.10 to 0.20 percent of O and Na2O is less than or equal to 0.10 to 0.20 percent; said group containing K2O、Na2O, F the K-containing concentrate is the concentrate with the granularity less than or equal to 0.074mm in the magnetite concentrate2O、Na2O, F the percentage of the total weight of the magnetite concentrate is at least 95%.
Further, the chemical components of the common magnetite concentrate comprise, by weight, 64.0-66.50% of TFe, 27.0-29.0% of FeO, 0.50-0.70% of MgO, 0.60-0.75% of CaO, and Al2O3Less than or equal to 0.5 percent of SiO24.50 to 5.50 percent of S, 0.10 to 0.15 percent of S, less than or equal to 0.05 percent of F, K2O≤0.08％，Na2O is less than or equal to 0.08 percent; and the percentage of the concentrate with the granularity less than or equal to 0.074mm in the common magnetite concentrate in the total weight of the fluoride-free magnetite concentrate is at least 80%.
Further, the bentonite comprises the following components in percentage by weight: SiO 22≤70.0％，MgO≥3.0％，Al2O3Is less than or equal to 15.00 percent, and the percentage of the fine grinding powder with the granularity of less than or equal to 0.074mm in the bentonite to the total weight of the bentonite is 95 percent.
Further, the chemical composition of the silica comprises SiO according to weight percentage2≥95％，Ig≤4.0％。
Furthermore, according to the weight percentage, the fluorine-containing magnetite concentrate is 90%, the fluorine-free magnetite concentrate is 10%, the external bentonite is 2.0%, the external silica is 1.5%, and the reduction expansion rate of the pellet ore is less than or equal to 20%.
Compared with the prior art, the invention has the beneficial technical effects that:
the invention realizes that the excellent-quality acid pellet ore is produced by adding 40-100% of baiyunebobo iron ore concentrate on the premise of controlling the reduction expansion rate of the acid pellet ore within 20%, and the compression strength, the drum strength and the metallurgical performance of the pellet ore prepared by the method can meet the smelting requirement of a large-scale blast furnace. Can provide technical support for further improving the proportioning of the Bayan obo iron ore concentrate for the steel-coated pellets, realizing the high-quality application of the Bayan obo iron ore concentrate in steel-coated sintering and pellet production and the adjustment of iron material purchasing strategy of companies. Meanwhile, the method plays a demonstration leading role in producing the pellet ore by using the ultrafine-grained magnetite concentrate and the fluorine-containing alkali-containing complex paragenetic ore for the metallurgical enterprises in China.
Detailed Description
The following examples further illustrate embodiments of the present invention, but the embodiments of the present invention are not limited to the following examples.
The raw material configuration, process parameters, pellet components and related properties of the pellets in each example are shown in tables 1-7, respectively.
TABLE 1 raw material proportioning of each example and comparative example
TABLE 2 statistics of green pellet quality for each example and comparative example
| Example numbering | Water content% | Falling strength of green ball, sub/P | Green ball compressive strength, N/P |
| Example 1 | 6.5 | 5.0 | 14.6 |
| Example 2 | 6.3 | 4.2 | 13.8 |
| Comparative example 1 | 6.8 | 3.8 | 11.8 |
| Comparative example 2 | 7.1 | 4.2 | 14.5 |
| Example 3 | 6.9 | 4.5 | 13.2 |
| Example 4 | 6.9 | 4.2 | 13.0 |
| Example 5 | 6.9 | 4.4 | 12.8 |
| Example 6 | 7.1 | 3.7 | 11.4 |
| Example 7 | 7.0 | 3.4 | 11.9 |
| Example 8 | 7.2 | 3.2 | 12.4 |
| Comparative example 3 | 7.4 | 3.8 | 12.6 |
| Example 9 | 7.1 | 3.6 | 14.6 |
| Example 10 | 7.1 | 3.7 | 11.9 |
| Example 11 | 6.8 | 4.3 | 12.7 |
| Comparative example 4 | 7.0 | 4.5 | 15.8 |
| Example 12 | 7.0 | 4.5 | 13.5 |
| Example 13 | 6.9 | 4.4 | 13.4 |
| Example 14 | 6.7 | 4.6 | 13.5 |
As can be seen from Table 2:
(1) the water content of the green ball is obviously increased along with the increase of the proportion of the silica, which shows that the water holding capacity of the green ball is enhanced after the silica is added.
(2) With the increase of the silica proportion and the increase of the moisture of the green ball, the falling strength of the green ball is reduced, and the change of the compression strength of the green ball is not obvious.
(3) In order to ensure that the falling strength of green pellets meets the production requirement, the proportion of bentonite needs to reach 1.6-2.5%.
TABLE 3 Dry ball Mass statistics for the examples and comparative examples
As can be seen from Table 3:
(1) the dry ball compression strength of the modified bentonite is obviously better than that of the bentonite for production.
(2) As the proportion of the silica is increased, the compressive strength of the dry ball is reduced slightly, which indicates that the addition of the silica is unfavorable for the compressive strength of the dry ball.
(3) As the silica proportion increases and the green pellet moisture increases, the green pellet cracking temperature decreases from 500 ℃ to 470 ℃.
TABLE 4 pellet roasting system and compression strength of each example and comparative example
As can be seen from Table 4:
(1) when the roasting temperature is 1200-1240 ℃, the compression strength of the finished ball can reach more than 2500N/P by adding the pipeline mixed concentrate with different proportions and adding the silica with different proportions on the basis.
(2) The addition of silica has no obvious influence on the compression strength of the finished product ball in the roasting temperature range of 1200-1240 ℃.
TABLE 5 pellet chemical composition of each example and comparative example
From the analysis in table 5 it can be seen that:
(1) when the proportion of the silica is increased by 0.5 percent, the SiO of the pellet ore2The content is improved by about 0.35 percentage point, and the grade of the pellet ore is reduced by about 0.25 percentage point.
(2) Along with the improvement of the proportioning of the baiyuneboite iron ore concentrate, the CaO content of the pellets is obviously improved, and K is2O、Na2The O, F content is obviously increased.
TABLE 6 metallurgical properties of pellets of examples and comparative examples
In order to ensure that the reduction expansion rate of the pellet ore is less than or equal to 20 percent, 100 percent of K is used2O、Na2O, F pellet prepared from magnetite concentrate, pellet SiO2The lower limit of the content control is 4.90 percent, and the upper limit of the alkalinity control is 0.25. Using 90% of K2O、Na2O, F pellet, SiO2The lower limit of the content control is 4.60 percent, and the upper limit of the alkalinity control is 0.25 to 0.30. Using 80% tubes containing K2O、Na2O, F the pellet is prepared by mixing the pellet with SiO2The lower limit of the content control is 4.60 percent, and the upper limit of the alkalinity control is 0.25 to 0.30. Using 70% of K2O、Na2O, F pellet, SiO2The lower limit of the content control is 4.20-4.30%, and the upper limit of the alkalinity control is 0.25. Using 50-60% of K2O、Na2O, F pellet, SiO2The lower limit of the content control is 4.10-4.20%, and the upper limit of the alkalinity control is 0.30.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (6)
1. A method for controlling chemical components of an alkali metal-containing pellet aimed at controlling a reduction expansion ratio, characterized by comprising:
adding 1.6 to 2.5 weight percent of adhesive in the iron-containing raw material, and fully mixing to obtain a mixture; the iron-containing raw material comprises the following components in percentage by weight: 40 to 100 percent of magnetite concentrate containing K2O, Na2O and F, 0 to 40 percent of common magnetite concentrate and 1.0 to 2.5 percent of externally-matched silica;
and (3) preparing the mixture into green pellets by applying a pelletizing disc, wherein the pelletizing disc is controlled by the following process parameters: the preparation time of green balls is 10min, the compaction time is 21min, the rotating speed of a ball disc is 30r/min, and the diameter of the ball disc is 1 m; the average particle size of the small balls is 11 mm;
drying, preheating, roasting and soaking the green pellets to obtain oxidized pellets;
wherein the drying conditions are: the temperature is 150-300 ℃, and the time is 15-30 min; the preheating condition is as follows: the temperature is 600-1000 ℃, and the time is 5-10 min; the roasting conditions are as follows: the temperature is 1160-1220 ℃, and the time is 8-12 min; the soaking conditions are as follows: the temperature is 900-1000 ℃, and the time is 2-4 min;
in order to ensure that the reduction expansion rate of the pellets is less than or equal to 20%:
using 100% K2O、Na2O, F pellet prepared from magnetite concentrate, pellet SiO2The lower limit of the content control is 4.90 percent, and the upper limit of the alkalinity control is 0.25;
using 90% of K2O、Na2O, F pellet, SiO2The lower limit of the content control is 4.60 percent, and the upper limit of the alkalinity control is 0.25 to 0.30;
using 80% of K2O、Na2O, F the pellet is prepared by mixing the pellet with SiO2The lower limit of the content control is 4.60 percent, and the upper limit of the alkalinity control is 0.25 to 0.30;
using 70% of K2O、Na2O, F pellet, SiO2The lower limit of the content control is 4.20-4.30%, and the upper limit of the alkalinity control is 0.25;
using 50-60% of K2O、Na2O, F pellet, SiO2The lower limit of the content control is 4.10-4.20%, and the upper limit of the alkalinity control is 0.30.
2. The method for controlling chemical composition of alkali-containing pellets aimed at controlling reduction expansion ratio according to claim 1, wherein: said group containing K2O、Na2O, F chemistry of magnetite concentrateThe components by weight percentage are as follows: 65.5 to 66.5 percent of TFe, 28.5 to 29.5 percent of FeO, 0.60 to 0.80 percent of MgO, 1.70 to 2.40 percent of CaO, and Al2O3≤0.20％，SiO20.80-1.70 percent of S, 0.65-1.05 percent of F, 0.25-0.35 percent of K20.10 to 0.20 percent of O and Na2O is less than or equal to 0.10 to 0.20 percent; said group containing K2O、Na2O, F the K-containing concentrate is the concentrate with the granularity less than or equal to 0.074mm in the magnetite concentrate2O、Na2O, F the percentage of the total weight of the magnetite concentrate is at least 95%.
3. The method for controlling chemical composition of alkali-containing pellets aimed at controlling reduction expansion ratio according to claim 1, wherein: the chemical components of the common magnetite concentrate comprise, by weight, 64.0-66.50% of TFe, 27.0-29.0% of FeO, 0.50-0.70% of MgO, 0.60-0.75% of CaO, and Al2O3Less than or equal to 0.5 percent of SiO24.50 to 5.50 percent of S, 0.10 to 0.15 percent of S, less than or equal to 0.05 percent of F, K2O≤0.08％，Na2O is less than or equal to 0.08 percent; and the percentage of the concentrate with the granularity less than or equal to 0.074mm in the common magnetite concentrate in the total weight of the fluoride-free magnetite concentrate is at least 80%.
4. The method for controlling chemical composition of alkali-containing pellets aimed at controlling reduction expansion ratio according to claim 1, wherein: the bentonite comprises the following components in percentage by weight: SiO 22≤70.0％，MgO≥3.0％，Al2O3Is less than or equal to 15.00 percent, and the percentage of the fine grinding powder with the granularity of less than or equal to 0.074mm in the bentonite to the total weight of the bentonite is 95 percent.
5. The method for controlling chemical composition of alkali-containing pellets aimed at controlling reduction expansion ratio according to claim 1, wherein: the chemical composition of the silica comprises SiO according to weight percentage2≥95％，Ig≤4.0％。
6. The method for controlling chemical composition of alkali-containing pellets aimed at controlling reduction expansion ratio according to claim 1, wherein: according to the weight percentage, the fluorine-containing magnetite concentrate is 90 percent, the fluorine-free magnetite concentrate is 10 percent, the external bentonite is 2.0 percent, the external silica is 1.5 percent, and the reduction expansion rate of the pellet ore is less than or equal to 20 percent.
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| CN115369239A (en) * | 2022-08-01 | 2022-11-22 | 包头钢铁（集团）有限责任公司 | Method for preparing pellets by recleaning iron ore concentrate from bayan obo tailings |
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| CN112195339A (en) * | 2020-09-22 | 2021-01-08 | 包头钢铁（集团）有限责任公司 | Contains K2O、Na2O, F pellet prepared by using magnetite concentrate as main material and combining with hematite concentrate and preparation method thereof |
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